Abstract: A three-dimensional OFDM apparatus of the present invention comprises: a serial-parallel conversion unit for converting a serial input signal into N parallel input signals; a three-dimensional signal mapping unit for mapping the N parallel input signals on three-dimensional coordinates of a cube-in-cube type constellation, respectively; and a two-dimensional inverse Fourier transform unit for performing an inverse Fourier transform by generating a two-dimensional matrix on the basis of the mapped three-dimensional coordinates.

Abstract: An experience information processing apparatus for a social networking service, includes an ontology unit for providing a social ontology including social connection information and location information of a user and a service ontology including web service information, service location information and tag information. Further, the experience information processing apparatus includes an experience information management unit for extracting experience information content having location information from a plurality of mobile devices, classifying the extracted experience information content using the ontology unit to establish an experience information database, and searching the established experience information database based on the location information in response to a request from the mobile device to provide a social media service by linking the social connections information, the location information, and the tag information.

Abstract: A method for indexing a suffix tree in a social network includes: scanning an input string and dividing the string into partitions each having a common prefix; performing no-merge suffix tree indexing on the divided partitions; storing information on the partitions on which no-merge suffix tree indexing is performed; storing suffix nodes of the no-merge suffix tree; and establishing a prefix tree. The performing no-merge suffix tree indexing includes: generating a set of suffixes having the common prefix in the input string; generating a suffix set from the set of suffixes and storing the suffix set; and building the suffix set as a sub-tree.

Abstract: A three-dimensional OFDN apparatus of the present invenstion comprises: a serial-parallel conversion unit for converting a serial input signal into N parallel input signals; a three-dimensional signal mapping unit for mapping the N parellel input signals on three-dimensional coordinates of a cube-in-cube type constellation, respectively; and a two-dimensional inverse Fourier transform unit for performing an inverse Fourier transform by generating a two-dimensional matrix on the basis of the mapped three-dimensional coordinates.

Abstract: A system for managing a dynamic digital community based on location and social relations includes a user location information collecting block configured to analyze user location information and provide a location searching function of searching for where the user terminal is. Further, the system includes a community lifecycle management block configured to provide a service for creating and deleting a digital community, a service for joining a digital community as a member and withdrawing from the digital community, and a community execution service to user terminals; and a digital community profile database configured to store community profiles about respective digital communities.

Abstract: An apparatus for sharing social media content includes a content management unit for, when sharable content is input by a user, extracting profile information about the sharable content by analyzing the sharable content, and generating social media content by associating the extracted profile information about the sharable content with profile information about a user to store the generated social media content in a database. Further, the apparatus for sharing the social media content includes a content searching unit for extracting an initial sample by searching the database based on keywords requested to be searched for in response to a search request of a user, and searching for the sample by comparing profile information about each piece of content included in the initial sample with one of the keywords.

Abstract: An experience information processing apparatus for a social networking service, includes an ontology unit for providing a social ontology including social connection information and location information of a user and a service ontology including web service information, service location information and tag information. Further, the experience information processing apparatus includes an experience information management unit for extracting experience information content having location information from a plurality of mobile devices, classifying the extracted experience information content using the ontology unit to establish an experience information database, and searching the established experience information database based on the location information in response to a request from the mobile device to provide a social media service by linking the social connections information, the location information, and the tag information.

Abstract: A method for indexing a suffix tree in a social network includes: scanning an input string and dividing the string into partitions each having a common prefix; performing no-merge suffix tree indexing on the divided partitions; storing information on the partitions on which no-merge suffix tree indexing is performed; storing suffix nodes of the no-merge suffix tree; and establishing a prefix tree. The performing no-merge suffix tree indexing includes: generating a set of suffixes having the common prefix in the input string; generating a suffix set from the set of suffixes and storing the suffix set; and building the suffix set as a sub-tree.

Abstract: Provided are a method for measuring characteristics of a path between nodes by using active testing packets based on priority, i.e., an inter-node path characteristic measuring method, which can measure and provide characteristics of a generated node, when an inter-node data transmission path is generated based on Multi-Protocol Label Switching (MPLS) to provide a path with satisfactory transmission delay, jitter and packet loss that are required by a user, and to provide a computer-readable recording medium for recording a program that implement the method. The method includes the steps of: a) synchronizing system time of the nodes with a global standard time; b) forming each testing packet; c) registering frame sequence and the global standard time during transmission; and d) calculating transmission delay time, jitter and packet loss by using time stamp and packet sequence information of a frame received by the destination node and transmitting the result to the management system.

Abstract: Provided are a method for measuring characteristics of a path between nodes by using active testing packets based on priority, i.e., an inter-node path characteristic measuring method, which can measure and provide characteristics of a generated node, when an inter-node data transmission path is generated based on Multi-Protocol Label Switching (MPLS) to provide a path with satisfactory transmission delay, jitter and packet loss that are required by a user, and to provide a computer-readable recording medium for recording a program that implement the method. The method includes the steps of: a) synchronizing system time of the nodes with a global standard time; b) forming each testing packet; c) registering frame sequence and the global standard time during transmission; and d) calculating transmission delay time, jitter and packet loss by using time stamp and packet sequence information of a frame received by the destination node and transmitting the result to the management system.